CVSS 6.0 (medium) · published 2026-10-13
The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-middle can select RDSTLS to override /sec:nla pinning, complete authentication with an all-zero cookie, and receive the user's cleartext password in the Client Info PDU.
Affected products (NVD): freerdp freerdp
Fixed in (NVD): 3.32.0
Weakness: CWE-757
Source: NVD CVE-2026-109952
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